Drill.



PATENTED 00T. 17,1905.

G. E. STONE.

DRILL.

APPLICATION FILED MAR. e. 1905.

idrill.

UNITED STATES PATENT oEEroE. t

CHARLES E. STONE. OF BUFFALO, NEW YORK, ASSIGNOR TO BUFFALO FORGECOMPANY, OF BUFFALO, NEW YORK.

DRILL.

Specification of Letters Patent.

Patented Oct. 17, 1905.

Application filed March 6, 1905. Serial No. 248,690.

To al when?, it may concern:

Be it known that l, CHARLES E. STONE, a citizen of the United States,residing at Bu tfalo,`

or moved longitudinally by an automatic or` hand-operated feed-screwarranged in line with and connected to the drill-spindle.

The objects of the invention are to provide a desirable detachablecoupling for the drillspindle and feed-screw of this type of drillswhereby the spindle can be readily discon-4 nected from the feed-screwand advanced and retracted by hand to enable rapid operation upon lightwork and to construct said detachable coupling with an antifrictionbearing,

which receives the end thrust of the drill-` spindle both when thelatter is operated by the feed-screw and by hand.

In the accompanying drawings, Figure l is.

aside elevation of a drill provided with a coupling and bearingembodying the invention. Fig. 2 is a fragmentary front elevation of theFig. 3 is a sectional elevation, on an enlarged scale, of the coupling'and bearing.

Fig. 4 is a fragmentary sectional elevation ofy the drill, on anenlarged scale, showing' the drill Spindle and feed screw disconnected.Fig. 5 is a fragmentary horizontal sectional plan, on an enlarged scale,in line 5 5, Fig. l.

Like letters of reference refer to like parts in the several figures.

The invention is illustrated as applied to a well-known type of uprightpower-drill, in which the drill-spindle is arranged vertically andpower-driven and is advanced to the work by a combined automatic andhand-operated screw-feed mechanism; but the improvements are equallyapplicable to other types of drills.

The known features of the drill shown in the drawings may be brieiiydescribed as follows: A represents the upright stationary frame; B, thevertically-adjustable work support or table; C, the verticaldrill-spindle, which is journaled to rotate and move longitudinally inbearings in the frame above the work-support; D, a horizontaldrive-shaft, which may be either hand or power operated and rotates thespindle through bevel-gears d and change-speed gears 62'; E, thenon-rotary feed-screw, which is connected to the spindle and extends upthrough a guide-bearing c on the frame and works in the screw-threadedhole of a rotary gear-wheel c', and F a'feedscrew-operating wheel, whichis secured to a horizontal shaft provided with a gear-wheel f, meshingwith the screw-threaded gearwheel c. By rotating the wheel F thescrewthreaded wheel c is rotated and the feedscrew E movedlongitudinally to advance or retract the spindle, according to thedirection of rotation of the screw-operating wheel F. The latter can beoperated by hand and also automatically by a pawl g, engagingratchetteeth on the wheel F and operated from the drive-shaft D by apitman g and pawl-lever g2. The machine as thus far described is ofwell-known construction and operation.

The drill-spindle C is detachably connected to the feed screw ordevice-Eby the combined coupling and thrust-bearing now to be described, wherebythe spindle can be quickly and with little trouble disconnected from andoperated independently of the feed screw or device.

H represents a hollow Shell or boX, which is loosely connected to theupper end of the drill-spindle in such manner that the spindle can turnin the shell, which is held from rotation. As shown in the drawings,(see Fig. 3,) the reduced upper end /L of the spindle extends into theshell througha hole in its lower end and has fixed on its end in theshell a bearing member or disk I, between which and a bearing-disk l/,fixed in the shell H, are rolling bearing balls or devices if. Therotary bearing-disk I is preferably 'secured on the spindle by aleft-hand screw-thread or a thread so directed as to cause thebearing-disk to tighten thereon in the rotation of the spindle, and theother or stationary bearing-disk is preferably threaded and screwed intoan internal thread in the shell and is fixed against rotation by aset-screw t". The stationary bearing-disk is provided with holes 2,adapted to receive a tool for inserting and removing the disk and whichalso serve as oil-holes to enable the lubrication of the bearing. An

antifriction-washer 3 of iiber or other suitkey 7n, of any desired form,capable of ready removal. A U-shaped key is shown, which enters pairs ofregistering holes in the head K and shell H. When the key is inserted,as shown in Figs. 3 and 5, the spindle is coupled to the feed-screw andmoved longitudinally therewith, and when the key is removed, as shown inFig. 4, the spindle is disconnected from the feed-screw and can beadvanced and retracted independently of the screw.

In the machine illustrated the couplingshell H and the feed-screw towhich it is secured are held from rotation by a finger Z, projectingfrom the shell and slidably engaging in an upright slot Z, Fig. 4, inthe frame. Any other means for holding the screw and shell from rotationcould be employed.

M represents ahand-lever fulcrumed on the frame and connected to thecoupling-shell for advancing and retracting the spindle by hand. Therear end of the lever is preferably forked and straddles thecoupling-shell lH' and frame A, to which it is pivoted by bolts or pinsm. One fork-arm is extended rearwardly beyond its pivot and providedwith a counterbalancing-weightm. The coupling-shell has lateralprojections or pins m2 working in slots m3 in the fork-arms of thelever.

When the drill-spindle is coupled tothe feed-screw,'as shown in Figs. 1and 2, it is fed to the work automatically by the ratchetand-pawlmechanism F g, or it can be fed slowly by hand by throwing the pawl goutof engagement with the ratchet-wheel F and turning the latter manuallyin the usual manner. When the character of the workis such as to permitfeeding of the drill by handpressure, or when anumber of holes are to bedrilled in light or thin stock, making rapid operation ofthe drillpossible and desirable, the coupling-key is removed to free thedrill-spindle from the feed-screw, when the spindle can be advanced andretracted'rapidly by the hand-lever. The coupling and uncoupling of thedrill-spindle and feed-'screw can be effected very rapidly and withlittle trouble or exertion by the coupling device described.

Y The ball thrust-bearing is also'moreeficiently located in theconstruction described than in the rmore common arrangement, where theball-bearing is located between the threaded operating-wheel e for thefeed-screw'and the frame, because there is much greater wear in thecoupling between the rapidly-rotating spindle and the stationaryfeed-screw than there is between the more slowly-rotating weel e and itsbearing. The combined coupling and bearing is exceedingly simple andinexpensive in construction. The ball thrustbearing receives the thrustofthe spindle both when the latter is coupled to the feed-screw and whendisconnected therefrom and operated by the lever.

feed device when the spindle is disconnected from the feed device,substantially as set forth.

Q. The combination of a longitudinally-movable rotatable drill-spindle,means for rotating the same, a feed-screw and operating means foradvancing the spindle, a coupling detachably connecting the spindle andfeed-screw and comprising parts carried by the spindle and feed-screw,respectively, and a lever connected to that part of the coupling carriedby the spindle for moving the latter longitudinally independently of thefeed-screw when the spindle is disconnected from the feedscrew,substantially as set forth.

Thecombination ofalongitudinally-movable rotatabledrill-spindle, meansfor rotating the same, a feed-screw and operating means for advancingthe spindle, a coupling device carried by the spindle and detachablyconnected to the feed-screw, an antifriction thrustbearing between thespindle and said coupling device` and means connected to said couplingdevice for moving the spindle longitudinally independently of thefeed-screw when vspindle and feed-screw comprisinga shell,

cooperating bearing members carried by the spindle and said shell, and amovable device detachably connecting said shell to the feedscrew,substantially as set forth.

5. The combination of a longitudinally-movable rotatable drill-spindle`means for rotating the same, afeed-screw and operating means foradvancing the spindle, and a combined coupling and thrust-bearingconnecting the spindle and feed-screw, comprising a shell looselyconnected to the spindle, cooperating bearing members fixed to thespindle and said shell, balls between said bearing members, a head fixedto the feed-screw and removably fitted in said shell, and a removablekey connecting said shell to the feed-screw, substantially as set forth.

Witness my hand this 17 th day of February, 1905.

CHARLES E. STONE.

Witnesses:

WM. BRAEMER, WM. L. Fox.

IOO

IIO

